CN215804739U - Electricity, heat, gas and water combined supply system coupled with back pressure machine - Google Patents
Electricity, heat, gas and water combined supply system coupled with back pressure machine Download PDFInfo
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- CN215804739U CN215804739U CN202122091027.4U CN202122091027U CN215804739U CN 215804739 U CN215804739 U CN 215804739U CN 202122091027 U CN202122091027 U CN 202122091027U CN 215804739 U CN215804739 U CN 215804739U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The utility model discloses an electricity, heat, gas and water combined supply system coupled with a back pressure machine. Compared with the method of directly heating seawater by adopting steam extraction, the method realizes reasonable gradient utilization of steam extraction heat and increases the output of electric/gas products of the unit. The utility model is provided with the exhaust steam cooler, can heat the desalted product water and then convey the desalted product water to a user side, and realizes the co-delivery of water and heat by adopting high-temperature product water. For the unit that has heat, water external supply simultaneously, simplified system configuration greatly, reduce pipeline construction and maintenance cost.
Description
Technical Field
The utility model belongs to the technical field of power plants and seawater utilization, and particularly relates to an electricity, heat, gas and water combined supply system coupled with a back pressure machine.
Background
With the rapid development of power generation by clean energy such as wind and light, thermal power generating units are gradually changing from a main status of power supply in a power system to a bottom-supporting status of power supply. In order to improve the profitability and the survival competitive power of the power plant, the thermal power generating unit needs to transform from single electric energy supply to an electricity, heat, steam, cold, water and other comprehensive energy supply base, and the diversity of externally supplied products is enriched, so that the profitability of the power plant is improved.
For a coastal power plant, seawater desalination and power generation thermodynamic cycle are combined, and low-grade exhaust steam of the power plant is used for providing steam required by seawater desalination, so that the seawater desalination cost can be greatly reduced. For a power plant with various product users, how to optimize and couple production process flows of various products and reduce unit energy consumption is an effective way for improving the profitability of the power plant.
Disclosure of Invention
The utility model aims to overcome the defects and provide an electricity, heat, gas and water combined supply system coupled with a back pressure machine, and reasonable and step utilization of extraction energy of a unit is realized by arranging a small back pressure turbine. The steam extracted by the unit firstly enters a small back pressure steam turbine to drag a generator or an air compressor to operate, and the exhausted steam enters an exhaust steam heat exchanger to heat product water.
In order to achieve the purpose, the seawater desalination device comprises a boiler, a steam outlet of the boiler is connected with a steam turbine unit through a pipeline, the steam turbine unit is connected with a first generator, a steam exhaust outlet of the steam turbine is connected with a condenser and a multi-effect distilled seawater desalination device through a pipeline, the condenser is cooled by seawater, a steam extraction outlet of the steam turbine unit is connected with a small back-pressure steam turbine through a pipeline, a steam exhaust outlet of the small back-pressure steam turbine is connected with an exhaust steam cooler, the small back-pressure steam turbine is connected with a second generator and an air compressor, a cooling water outlet of the condenser (4) is connected with the multi-effect distilled seawater desalination device, the multi-effect distilled seawater desalination device is used for separating seawater into strong brine and product water, a product water outlet of the multi-effect distilled seawater desalination device is connected with the exhaust steam cooler and a conveying pipeline, and the product water after temperature rise in the exhaust steam cooler is conveyed to a user side through the conveying pipeline.
A first valve is arranged on a connecting pipeline of the steam turbine set and the back pressure type small steam turbine.
And a second valve is arranged on a connecting pipeline of the steam turbine and the multi-effect distilled seawater desalting device.
And a third valve is arranged on a connecting pipeline between a cooling water outlet of the condenser and the multi-effect distilled seawater desalination device.
A fourth valve is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device and the exhaust steam cooler;
and a fifth valve is arranged on a connecting pipeline of the multi-effect distilled seawater desalting device and the conveying pipeline.
The user side comprises a heat exchange device, the heat exchange device is connected with the conveying pipeline, the heat exchange device is used for exchanging heat between high-temperature product water and urban heat supply network return water, heat is transferred to the urban heat supply network return water, the high-temperature product water becomes normal-temperature product water, and the normal-temperature product water is supplied to a water plant or other fresh water users.
And a sixth valve is arranged on a connecting pipeline between the conveying pipeline and the heat exchange device, and a seventh valve is arranged on a connecting pipeline between the conveying pipeline and the water plant.
A condensed water outlet of the multi-effect distilled seawater desalting device is connected with a set condensed water system;
a condensed water outlet of the condenser is connected with a unit condensed water system;
and a condensed water outlet of the exhaust steam cooler is connected with a set condensed water system.
The small back pressure turbine is connected with the second generator through the first clutch, and the small back pressure turbine is connected with the air compressor through the second clutch.
The heat-insulating layer is arranged outside the conveying pipeline.
Compared with the prior art, the utility model is provided with the small back pressure turbine, the steam extracted by the unit firstly enters the small back pressure turbine to do work, the generator or the air compressor is dragged to operate, and the exhausted steam enters the exhaust steam cooler to heat the seawater to raise the temperature. Compared with the method of directly heating seawater by adopting steam extraction, the method realizes reasonable gradient utilization of steam extraction heat and increases the output of electric/gas products of the unit. The utility model is provided with the exhaust steam cooler, can heat the desalted product water and then convey the desalted product water to a user side, and realizes the co-delivery of water and heat by adopting high-temperature product water. For the unit that has heat, water external supply simultaneously, simplified system configuration greatly, reduce pipeline construction and maintenance cost.
Furthermore, the double clutches are arranged, so that the flexible switching of the output work of the back pressure type small steam turbine between the generator and the air compressor is realized. The system can flexibly adjust the output according to the requirements of external electric/gas products.
Drawings
FIG. 1 is a system diagram of the present invention;
the system comprises a boiler 1, a steam turbine unit 2, a steam turbine unit 3, a first generator 4, a condenser 5, a multi-effect distilled seawater desalination device 6, a back-pressure small steam turbine 7, a second generator 8, an air compressor 9, a first clutch 10, a second clutch 11, a steam exhaust cooler 12, a conveying pipe network 13, a heat exchange device 14, a first valve 15, a second valve 16, a third valve 17, a fourth valve 18, a fifth valve 19, a sixth valve 20 and a seventh valve.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
Referring to fig. 1, the steam turbine comprises a boiler 1, a steam outlet of the boiler 1 is connected with a steam turbine set 2 through a pipeline, the steam turbine set 2 is connected with a first generator 3, a steam exhaust outlet of the steam turbine 2 is connected with a condenser 4 and a multi-effect distilled seawater desalination device 5 through a pipeline, the condenser 4 is cooled by seawater, a steam exhaust outlet of the steam turbine set 2 is connected with a small back-pressure steam turbine 6 through a pipeline, a first valve 14 is arranged on a connecting pipeline of the steam turbine set 2 and the small back-pressure steam turbine 6, a second valve 15 is arranged on a connecting pipeline of the steam turbine 2 and the multi-effect distilled seawater desalination device 5, a steam exhaust outlet of the small back-pressure steam turbine 6 is connected with a steam exhaust steam cooler 11, the small back-pressure steam turbine 6 is connected with a second generator 7 and an air compressor 8, the small back-pressure steam turbine 6 is connected with the second generator 7 through a first clutch 9, and the small back-pressure steam turbine 6 is connected with the air compressor 8 through a second clutch 10. A cooling water outlet of the condenser 4 is connected with a multi-effect distilled seawater desalination device 5, a third valve 16 is arranged on a connecting pipeline between the cooling water outlet of the condenser 4 and the multi-effect distilled seawater desalination device 5, the multi-effect distilled seawater desalination device 5 is used for separating seawater into strong brine and product water, a product water outlet of the multi-effect distilled seawater desalination device 5 is connected with an exhaust steam cooler 11 and a conveying pipeline 12, the product water after being heated in the exhaust steam cooler 11 is conveyed to a user side through the conveying pipeline 12, and a fourth valve 17 is arranged on a connecting pipeline between the multi-effect distilled seawater desalination device 5 and the exhaust steam cooler 11; a fifth valve 18 is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device 5 and the conveying pipeline 12. A condensed water outlet of the multi-effect distilled seawater desalting device 5 is connected with a set condensed water system; a condensed water outlet of the condenser 4 is connected with a unit condensed water system; the condensed water outlet of the dead steam cooler 11 is connected with a unit condensed water system.
The user side includes heat transfer device 13, and heat transfer device 13 connects pipeline 12, and heat transfer device 13 is used for carrying out the heat transfer with high temperature product water and urban heat supply network return water, gives urban heat supply network return water heat transfer, and high temperature product water becomes normal atmospheric temperature product water, and normal atmospheric temperature product water supplies water plant or other fresh water users. A sixth valve 19 is arranged on a connecting pipeline between the conveying pipeline 12 and the heat exchange device 13, and a seventh valve 20 is arranged on a connecting pipeline between the conveying pipeline 12 and the water plant.
The working method of the utility model comprises the following steps:
the new steam at the outlet of the boiler 1 enters the steam turbine set 2 to do work to drive the first generator 3 to generate power, and the exhaust steam of the steam turbine 2 enters the condenser 4 to be condensed and then returns to a set condensed water system. The condenser 4 is cooled by seawater.
And opening a first valve 14, introducing certain stage of extracted steam of the steam turbine set into the small back pressure turbine 6 to push the steam turbine to do work, and exhausting steam of the small back pressure turbine 6 into the exhaust steam cooler 11.
The back pressure turbine 6 is connected to a second generator 7 through a first clutch 9 and to an air compressor 8 through a second clutch 10. The switching of the work output of the back pressure type small turbine 6 between the second generator 7 and the air compressor 8 can be realized by the change of the opening and closing states of the first clutch 9 and the second clutch 10.
When the seawater desalination device is started, the first valve 15 and the second valve 16 are opened, and the temperature of the outlet part of the condenser 4 is raised to allow seawater to enter the multi-effect distillation seawater desalination device 5. And part of the exhausted steam of the turbine set 2 enters a multi-effect distillation seawater desalination device 5, and after multi-effect distillation with seawater is completed, the steam is condensed and released to return to a set condensed water system. The seawater is separated into strong brine and product water in the multi-effect distillation seawater desalination device 5.
When the unit supplies heat to the outside simultaneously, the fourth valve 17 and the sixth valve 19 are opened, the fifth valve 18 and the seventh valve 20 are closed, and the product water at the outlet of the multi-effect distilled seawater desalination device 5 enters the exhaust steam cooler 11, absorbs the heat of the exhaust steam, and is sent into the conveying pipeline 12 after being heated. And the exhaust steam returns to a unit condensate system after being cooled and condensed. On the user side, the high-temperature product water exchanges heat with the urban heat supply network backwater in the heat exchange device 13, transfers heat to the heat supply network water, and then is supplied to a water plant or other fresh water users as normal-temperature product water.
The exterior of the delivery pipe 12 is provided with insulation to reduce heat loss during delivery of the high temperature product water.
When the unit does not supply heat to the outside, the fourth valve 17 and the sixth valve 19 are closed, the fifth valve 18 and the seventh valve 20 are opened, and the product water at the outlet of the multi-effect distilled seawater desalination device 5 directly enters the conveying pipeline 12 to be conveyed to the user side. On the consumer side, the product water is delivered via a seventh valve 20 to a water plant or other fresh water consumer.
The utility model makes the extracted steam of the unit enter a small back pressure turbine to drag an air compressor or a generator to operate, and the exhausted steam is used for heating and desalinating product water. The product water is sent out after being heated, and the simultaneous sending of the external water and the heat is realized. Compared with a water and heat distribution system, the system simplifies the pipeline arrangement of the system and reduces the pipeline construction and maintenance cost. Meanwhile, the system can realize external power supply, gas and water of the power plant, enrich the diversity of external products of the power plant and improve the profitability of the power plant.
Claims (9)
1. A power, heat, gas and water combined supply system coupled with a back pressure machine is characterized by comprising a boiler (1), wherein a steam outlet of the boiler (1) is connected with a steam turbine unit (2) through a pipeline, the steam turbine unit (2) is connected with a first power generator (3), a steam exhaust outlet of the steam turbine unit (2) is connected with a condenser (4) and a multi-effect distillation seawater desalination device (5) through a pipeline, the condenser (4) is cooled by seawater, a steam exhaust outlet of the steam turbine unit (2) is connected with a back pressure type small steam turbine (6) through a pipeline, a steam exhaust outlet of the back pressure type small steam turbine (6) is connected with a steam cooler (11), the back pressure type small steam turbine (6) is connected with a second power generator (7) and an air compressor (8), a cooling water outlet of the condenser (4) is connected with the multi-effect distillation seawater desalination device (5), and the multi-effect distillation seawater desalination device (5) is used for separating seawater into strong brine and product desalinated water, the product water outlet of the multi-effect distillation seawater desalination device (5) is connected with an exhaust steam cooler (11) and a conveying pipeline (12), and the product water heated in the exhaust steam cooler (11) is conveyed to the user side through the conveying pipeline (12).
2. An electricity, heat, gas and water combined supply system coupled with a back pressure machine according to claim 1, characterized in that a first valve (14) is arranged on a connecting pipeline of the steam turbine set (2) and the small back pressure steam turbine (6).
3. The electricity, heat, gas and water combined supply system coupled with the back pressure machine as claimed in claim 1, wherein a second valve (15) is arranged on a connecting pipeline of the turboset (2) and the multi-effect distilled seawater desalination device (5);
a third valve (16) is arranged on a connecting pipeline between a cooling water outlet of the condenser (4) and the multi-effect distilled seawater desalination device (5).
4. The electricity, heat, gas and water combined supply system coupled with the back pressure machine as claimed in claim 1, wherein a fourth valve (17) is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device (5) and the exhaust steam cooler (11);
a fifth valve (18) is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device (5) and the conveying pipeline (12).
5. The electricity, heat, gas and water combined supply system coupled with the back pressure machine as claimed in claim 1, wherein the user side comprises a heat exchange device (13), the heat exchange device (13) is connected with the conveying pipeline (12), the heat exchange device (13) is used for exchanging heat between high-temperature product water and urban heat supply network backwater, and transferring heat to the urban heat supply network backwater, the high-temperature product water becomes normal-temperature product water, and the normal-temperature product water is supplied to a water plant or other fresh water users.
6. An electricity, heat, gas and water combined supply system coupled with a back pressure machine as claimed in claim 5, characterized in that a sixth valve (19) is arranged on the connecting pipeline of the conveying pipeline (12) and the heat exchange device (13), and a seventh valve (20) is arranged on the connecting pipeline of the conveying pipeline (12) and the water plant.
7. The electricity, heat, gas and water combined supply system coupled with the back pressure machine as claimed in claim 1, wherein the condensed water outlet of the multi-effect distilled seawater desalination device (5) is connected with a machine set condensed water system;
a condensed water outlet of the condenser (4) is connected with a unit condensed water system;
the condensed water outlet of the dead steam cooler (11) is connected with a set condensed water system.
8. An electricity, heat, gas and water combined supply system coupled with a back pressure machine according to claim 1, characterized in that the small back pressure turbine (6) is connected with the second generator (7) through a first clutch (9), and the small back pressure turbine (6) is connected with the air compressor (8) through a second clutch (10).
9. An electricity, heat, gas and water combined supply system coupled with a back pressure machine according to claim 1, characterized in that an insulating layer is arranged outside the conveying pipeline (12).
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114922699A (en) * | 2022-05-11 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Cooling system of boiler steam turbine generator unit and control method |
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2021
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114922699A (en) * | 2022-05-11 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Cooling system of boiler steam turbine generator unit and control method |
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